> Got it clear now: The crash happens when I boot to serial console and xdm
> tries to open the local display. I don't think this should cause a panic.

I too found that booting from serial console renders the internal
video useless on my IIvx. I don't think we get/deal with the screen
base properly when you do a serial boot. 

> _erasecursor(864da4,d271a,0,3,6c00800) + c
> _iteoff(0,3,6c00800,864db8,d24fa) + 4
> _grfon(a00,190,a,864df4,4ae4a) + 1c
> _grfopen(a00,3,2000,6be0200) + 50
> _spec_open(864e18) + 13c

See how the ite driver is trying to touch VRAM? It's probably trying
to erasecursor over the trap vector tables :-)